ITMI20071123A1 - REGENERATION METHOD OF THE PARTICULATE FILTER OF AN INTERNAL COMBUSTION ENGINE AND INTERNAL COMBUSTION ENGINE THAT CAN IMPLEMENT THIS METHOD - Google Patents
REGENERATION METHOD OF THE PARTICULATE FILTER OF AN INTERNAL COMBUSTION ENGINE AND INTERNAL COMBUSTION ENGINE THAT CAN IMPLEMENT THIS METHOD Download PDFInfo
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- ITMI20071123A1 ITMI20071123A1 IT001123A ITMI20071123A ITMI20071123A1 IT MI20071123 A1 ITMI20071123 A1 IT MI20071123A1 IT 001123 A IT001123 A IT 001123A IT MI20071123 A ITMI20071123 A IT MI20071123A IT MI20071123 A1 ITMI20071123 A1 IT MI20071123A1
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- Prior art keywords
- fuel
- unit
- exhaust
- high pressure
- valve
- Prior art date
Links
- 238000002485 combustion reaction Methods 0.000 title claims description 48
- 238000000034 method Methods 0.000 title claims description 16
- 238000011069 regeneration method Methods 0.000 title claims description 13
- 239000000446 fuel Substances 0.000 claims description 43
- 238000005086 pumping Methods 0.000 claims description 23
- 238000011144 upstream manufacturing Methods 0.000 claims description 10
- 230000008929 regeneration Effects 0.000 claims description 9
- 230000010355 oscillation Effects 0.000 claims description 2
- 230000001172 regenerating effect Effects 0.000 claims 1
- 239000007789 gas Substances 0.000 description 11
- 239000013618 particulate matter Substances 0.000 description 5
- 230000002596 correlated effect Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
- F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/22—Control of additional air supply only, e.g. using by-passes or variable air pump drives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/30—Arrangements for supply of additional air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/36—Arrangements for supply of additional fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1433—Pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1446—Means for damping of pressure fluctuations in the delivery system, e.g. by puffer volumes or throttling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Toxicology (AREA)
- Health & Medical Sciences (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Fuel-Injection Apparatus (AREA)
- Exhaust Gas After Treatment (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
DESCRIZIONE DESCRIPTION
di Brevetto per Invenzione Industriale, Patent for Industrial Invention,
La presente invenzione è relativa ad un metodo di rigenerazione del filtro antiparticolato di un motore a combustione interna. The present invention relates to a regeneration method of the particulate filter of an internal combustion engine.
Le emissioni dei motori a combustione interna alimentati a gasolio contengono una considerevole quantità di particolato e sono state limitate da severe norme antinquinamento. I motori a combustione interna alimentati a gasolio sono equipaggiati con un filtro antiparticolato in modo da trattenere il particolato e rispettare determinati parametri antinquinamento stabiliti dalle normative vigenti. La capacità del filtro antiparticolato è limitata e ciclicamente il filtro antiparticolato deve essere rigenerato tramite cicli di combustione del particolato all'interno del filtro. La combustione del particolato produce anidride carbonica che è espulsa dal filtro assieme ai gas di scarico e, di fatto, determina lo svuotamento del filtro antiparticolato. La necessità di effettuare la rigenerazione del filtro antiparticolato dipende dal regime di funzionamento del motore a combustione interna e dalle transizioni del regime di funzionamento. Infatti, particolari condizioni di funzionamento del motore a combustione interna determinano delle temperature dei gas di scarico in grado di innescare la combustione del particolato trattenuto dal filtro e, nel contempo, determinano l'afflusso di ossigeno necessario a realizzare la combustione e liberare parzialmente il filtro dal particolato stesso. Tuttavia, i regimi e le transizioni di regime che determinano le condizioni sopra riportate non sono mantenute per un tempo sufficiente a determinare la rigenerazione (svuotamento) completa del filtro antiparticolato ed è, quindi, necessario che le condizioni di temperatura e di eccesso di aria dei gas di scarico siano determinate e siano mantenute per un tempo sufficiente a realizzare la rigenerazione (svuotamento) completa del filtro antiparticolato. Emissions from diesel fueled internal combustion engines contain a considerable amount of particulate matter and have been limited by strict anti-pollution regulations. The internal combustion engines fueled by diesel are equipped with a particulate filter in order to retain the particulate and comply with certain anti-pollution parameters established by the regulations in force. The capacity of the particulate filter is limited and the particulate filter must be regenerated cyclically via combustion cycles of the particulate inside the filter. The combustion of the particulate produces carbon dioxide which is expelled from the filter together with the exhaust gases and, in fact, determines the emptying of the particulate filter. The need for regeneration of the particle filter depends on the operating speed of the internal combustion engine and the transitions in the operating speed. In fact, particular operating conditions of the internal combustion engine determine the temperatures of the exhaust gases capable of triggering the combustion of the particulate matter retained by the filter and, at the same time, determine the flow of oxygen necessary to carry out the combustion and partially free the filter. from the particulate matter itself. However, the speeds and regime transitions that determine the above conditions are not maintained for a time sufficient to determine the complete regeneration (emptying) of the particulate filter and it is therefore necessary that the temperature and excess air conditions of the exhaust gases are determined and maintained for a time sufficient to complete regeneration (emptying) of the particulate filter.
La temperatura necessaria ad innescare la combustione del particolato all'interno del filtro antiparticolato è fornita tramite post-combustione nel condotto dei gas di scarico alimentando aria in eccesso e combustibile nel condotto dei gas di scarico. The temperature needed to trigger the combustion of the particulate matter inside the particulate filter is provided by post-combustion in the exhaust gas duct by feeding excess air and fuel into the exhaust gas duct.
La post-combustione è realizzata a monte del filtro antiparticolato lungo il condotto dei gas di scarico e prevede l'alimentazione di combustibile in questo punto ad una pressione media superiore a 6 bar. Questa necessità impone che il veicolo sia dotato di una pompa del combustibile in grado di alimentare il combustibile a monte del filtro antiparticolato in qualsiasi condizione di funzionamento del motore a combustione interna. The post-combustion is carried out upstream of the particulate filter along the exhaust gas duct and provides for the supply of fuel at this point at an average pressure higher than 6 bar. This necessity requires the vehicle to be equipped with a fuel pump capable of supplying the fuel upstream of the particulate filter in any operating condition of the internal combustion engine.
Lo scopo della presente invenzione è quello di fornire un metodo di rigenerazione di un filtro antiparticolato di un motore a combustione interna che sia esente dagli inconvenienti dell'arte nota e che, in particolare, sia particolarmente economico. The object of the present invention is to provide a regeneration method of a particulate filter of an internal combustion engine which is free from the drawbacks of the known art and which, in particular, is particularly economical.
Secondo la presente invenzione è fornito un metodo di rigenerazione di un filtro antiparticolato di un motore a combustione interna, il metodo comprendendo le fasi di alimentare aria comburente nel condotto di scarico a monte del filtro antiparticolato per realizzare una post-combustione nel condotto di scarico e di alimentare il combustibile ai cilindri del motore a combustione interna tramite un gruppo di pompaggio ad alta pressione, il metodo essendo caratterizzato dal fatto di alimentare il combustibile nel condotto di scarico tramite il gruppo di pompaggio ad alta pressione . According to the present invention, a regeneration method of a particulate filter of an internal combustion engine is provided, the method comprising the steps of feeding combustion air into the exhaust duct upstream of the particulate filter to achieve afterburning in the exhaust duct and to feed the fuel to the cylinders of the internal combustion engine by means of a high pressure pumping unit, the method being characterized by feeding the fuel into the exhaust duct by means of the high pressure pumping unit.
La presente invenzione è inoltre relativa ad un motore a combustione interna. The present invention also relates to an internal combustion engine.
Secondo la presente invenzione è realizzato un motore a combustione interna comprendente un'unità motrice provvista di cilindri, un'unità di scarico comprendente un filtro antiparticolato; un'unità di alimentazione di aria comburente per alimentare i cilindri e l'unità di scarico; un'unità di alimentazione del combustibile ai cilindri comprendente un gruppo di pompaggio ad alta pressione; il motore a combustione interna essendo caratterizzato dal fatto di comprendere un dispositivo di alimentazione di combustibile di post-combustione all'unità di scarico; il dispositivo di alimentazione comprendendo una linea di alimentazione collegata ad un'uscita di combustibile in pressione del gruppo di pompaggio ad alta pressione. According to the present invention, an internal combustion engine is provided comprising a drive unit provided with cylinders, an exhaust unit comprising a particulate filter; a combustion air supply unit to feed the cylinders and the exhaust unit; a cylinder fuel supply unit comprising a high pressure pumping unit; the internal combustion engine being characterized in that it comprises a post-combustion fuel supply device to the exhaust unit; the feeding device comprising a feeding line connected to a pressurized fuel outlet of the high pressure pumping unit.
Ulteriori caratteristiche e vantaggi della presente invenzione appariranno chiari dalla descrizione che segue di un suo esempio non limitativo di attuazione, con riferimento alla figura annessa, la quale è una vista schematica, con parti asportate per chiarezza, di un motore a combustione interna realizzato secondo la presente invenzione. Further characteristics and advantages of the present invention will become clear from the following description of a non-limiting example of implementation thereof, with reference to the attached figure, which is a schematic view, with parts removed for clarity, of an internal combustion engine built according to the present invention.
Nella figura allegata, con 1 è indicato nel suo complesso un motore a combustione interna, il quale comprende un'unità motrice 2; un'unità di alimentazione 3 di aria comburente all'unità motrice 2; un'unità di alimentazione 4 di combustibile all'unità motrice 2, nella fattispecie gasolio; un'unità di scarico 5 dei gas combusti; ed un dispositivo di alimentazione 6 di combustibile nell'unità di scarico 5 per realizzare una post -combustione nell'unità di scarico 5. In the attached figure, 1 indicates as a whole an internal combustion engine, which comprises a drive unit 2; a combustion air supply unit 3 to the drive unit 2; a fuel supply unit 4 to the drive unit 2, in this case gas oil; a flue gas discharge unit 5; and a device 6 for feeding fuel into the exhaust unit 5 for realizing afterburning in the exhaust unit 5.
L'unità motrice 2 comprende una testata 7, in cui sono ricavati quattro cilindri 8, ciascuno dei quali comunica direttamente con l'unità di alimentazione 3 dell'aria comburente; con l'unità di alimentazione 4 del combustibile; e con l'unità di scarico 5. L'unità motrice 2 trasforma l'energia termica in energia meccanica che è fornita ad un albero motore 9. The drive unit 2 comprises a head 7, in which four cylinders 8 are formed, each of which communicates directly with the combustion air supply unit 3; with the fuel supply unit 4; and with the exhaust unit 5. The drive unit 2 transforms thermal energy into mechanical energy which is supplied to a drive shaft 9.
L'unità di alimentazione 3 comprende un condotto di alimentazione 10 collegato a ciascun cilindro 8, un compressore 11, un riscaldatore 12 ed una valvola di regolazione 13 del flusso di aria. The supply unit 3 comprises a supply duct 10 connected to each cylinder 8, a compressor 11, a heater 12 and a valve 13 for regulating the air flow.
L'unità di alimentazione 4 del combustibile è del tipo denominato "common rail" e comprende un serbatoio 14 del combustibile ed una linea di alimentazione 15, lungo la quale sono disposti in successione, un filtro 16, un gruppo di pompaggio ad alta pressione 17, ed un distributore 18 comune a tutti i cilindri 6. Il dispositivo di alimentazione 4 comprende quattro iniettori 19, ciascuno dei quali è associato ad un rispettivo cilindro 6 ed è collegato al distributore 18 da una rispettiva linea 20. The fuel supply unit 4 is of the type called "common rail" and comprises a fuel tank 14 and a supply line 15, along which a filter 16, a high pressure pumping unit 17 are arranged in succession. , and a distributor 18 common to all cylinders 6. The feeding device 4 comprises four injectors 19, each of which is associated with a respective cylinder 6 and is connected to the distributor 18 by a respective line 20.
Il gruppo di pompaggio ad alta pressione 17 comprende una pompa a pistoni 21, ed una pompa ad ingranaggi 22, la quale ha la funzione di alimentare la pompa a pistoni 21 e, selettivamente, il dispositivo di alimentazione 6 del combustibile. Il gruppo di pompaggio ad alta pressione 17 comprende un albero di azionamento 23 della pompa a pistoni 21 e della pompa ad ingranaggi 22 ed una trasmissione cinematica 24 (indicata in modo schematico a linee tratteggiate) per collegare l'albero motore 9 all'albero di azionamento 23 . The high-pressure pumping unit 17 comprises a piston pump 21, and a gear pump 22, which has the function of supplying the piston pump 21 and, selectively, the fuel supply device 6. The high-pressure pumping unit 17 comprises a drive shaft 23 of the piston pump 21 and of the gear pump 22 and a kinematic transmission 24 (indicated schematically in dashed lines) to connect the motor shaft 9 to the drive shaft drive 23.
L'unità di scarico 5 comprende un condotto di scarico 25, il quale è collegato ai cilindri 8; una turbina 26, la quale è alloggiata nel condotto di scarico 25 ed è collegata da un albero 27 al compressore 11; una camera di combustione 28 disposta lungo il condotto di scarico 25; ed un filtro antiparticolato 29, il quale è alloggiato nel condotto di scarico 25 a valle della camera di combustione 28. The exhaust unit 5 comprises an exhaust duct 25, which is connected to the cylinders 8; a turbine 26, which is housed in the exhaust duct 25 and is connected by a shaft 27 to the compressor 11; a combustion chamber 28 arranged along the exhaust duct 25; and a particulate filter 29, which is housed in the exhaust duct 25 downstream of the combustion chamber 28.
L'unità di alimentazione 3 è collegata all'unità di scarico 5 tramite un condotto di by-pass 30: nella fattispecie, il condotto di by-pass 30 è disposto lungo il condotto di alimentazione 10 a valle del compressore 11 e, lungo il condotto di scarico 25, a monte della camera di combustione 28. Lungo il condotto di by-pass 30 sono disposti in successione una valvola di regolazione 31 ed un riscaldatore 32 per portare l'aria ad un temperatura prossima alla temperatura dei gas di scarico . The supply unit 3 is connected to the discharge unit 5 by means of a by-pass duct 30: in this case, the by-pass duct 30 is arranged along the supply duct 10 downstream of the compressor 11 and, along the exhaust duct 25, upstream of the combustion chamber 28. A regulating valve 31 and a heater 32 are arranged in succession along the by-pass duct 30 to bring the air to a temperature close to the temperature of the exhaust gases.
II dispositivo di alimentazione 6 è atto a fornire il combustibile necessario alla post-combustione nella camera di combustione 28 a monte del filtro antiparticolato 29 e comprende una linea di alimentazione 33 di combustibile che collega il gruppo di pompaggio ad alta pressione 17 al condotto di scarico 25 immediatamente a monte della camera di combustione 28; un raccordo 34 di collegamento della linea di alimentazione 33 al gruppo di pompaggio ad alta pressione 17; un iniettore di combustibile 35 atto ad iniettare il combustibile nel condotto di scarico 25; una valvola di intercettazione 36 del tipo on-off per selettivamente alimentare il combustibile lungo la linea di alimentazione 23; ed un'unità di controllo 37. The feed device 6 is adapted to supply the fuel necessary for post-combustion in the combustion chamber 28 upstream of the particulate filter 29 and comprises a fuel feed line 33 which connects the high-pressure pumping unit 17 to the exhaust duct. 25 immediately upstream of the combustion chamber 28; a fitting 34 for connecting the supply line 33 to the high pressure pumping unit 17; a fuel injector 35 adapted to inject fuel into the exhaust duct 25; an interception valve 36 of the on-off type for selectively feeding the fuel along the supply line 23; and a control unit 37.
L'unità di controllo 37 è atta a determinare l'attivazione del ciclo di rigenerazione del filtro antiparticolato 29 e, quindi, di dosare la portata di combustibile nel condotto di scarico 25 in funzione della saturazione del filtro antiparticolato 29 e della temperatura dei gas di scarico nel condotto di scarico 25. The control unit 37 is adapted to determine the activation of the regeneration cycle of the particulate filter 29 and, therefore, to dose the flow of fuel in the exhaust duct 25 as a function of the saturation of the particulate filter 29 and the temperature of the gases. exhaust in the exhaust duct 25.
Nella fattispecie, il condotto di scarico 25 è equipaggiato con un sensore differenziale di pressione 38 per rilevare la differenza di pressione a monte e a valle del filtro antiparticolato 29 e di emettere un segnale DP correlato alla differenza di pressione; un sensore di temperature 39 disposto a monte della camera di combustione di combustione 28 ed atto ad emettere un segnale di temperatura Tl; ed un sensore di temperatura 4 0 disposto fra la camera di combustione 28 ed il filtro antiparticolato 29 ed atto ad emettere un segnale di temperatura T2. In this case, the exhaust duct 25 is equipped with a differential pressure sensor 38 to detect the pressure difference upstream and downstream of the particulate filter 29 and to emit a signal DP correlated to the pressure difference; a temperature sensor 39 arranged upstream of the combustion chamber 28 and able to emit a temperature signal Tl; and a temperature sensor 4 0 arranged between the combustion chamber 28 and the particulate filter 29 and able to emit a temperature signal T2.
In uso, l'unità di controllo 37 confronta il segnale DP con un valore di soglia DPS in un blocco di comparazione 41: quando il segnale DP è maggiore del valore di soglia DPS, l'unità di controllo 37 emette un segnale di rigenerazione RS, il quale provvede ad aprire la valvola di intercettazione 31. I segnali Tl e T2 sono confrontati con un valore di autocombustione TA del particolato ed un valore di sicurezza TS . In pratica, il valore di autocombustione TA è correlato alla temperatura di autocombustione del particolato, ossia la temperatura oltre la quale il particolato brucia trasformandosi in ossido di carbonio, mentre il valore di sicurezza TS è correlato ad una temperatura, oltre la quale gli elementi strutturali dell'unità di scarico 5 potrebbero subire dei danni causati dalle alte temperature della post-combustione e dei gas di scarico. In use, the control unit 37 compares the signal DP with a threshold value DPS in a comparison block 41: when the signal DP is greater than the threshold value DPS, the control unit 37 outputs a regeneration signal RS , which opens the interception valve 31. The signals Tl and T2 are compared with a self-combustion value TA of the particulate matter and a safety value TS. In practice, the self-ignition value TA is correlated to the self-combustion temperature of the particulate, i.e. the temperature above which the particulate burns, transforming itself into carbon monoxide, while the safety value TS is correlated to a temperature, beyond which the structural elements of the exhaust unit 5 could be damaged by the high temperatures of the post-combustion and the exhaust gases.
In sostanza, l'unità di controllo 37 confronta i segnali di temperatura T1 e T2 con i valori di autocombustione TA e di sicurezza TS in un blocco di comparazione 42 ed emette un segnale di dosaggio DS di azionamento dell'iniettore di combustibile 35 sulla base di algoritmi che prevedono di mantenere il segnale di temperatura T2 il più alto possibile, in ogni caso maggiore del valore di autocombustione TA, senza rischiare di superare il valore di sicurezza TS. In essence, the control unit 37 compares the temperature signals T1 and T2 with the self-ignition values TA and safety TS values in a comparison block 42 and emits a dosage signal DS for activating the fuel injector 35 on the base of algorithms that provide for keeping the temperature signal T2 as high as possible, in any case greater than the self-ignition value TA, without risking to exceed the safety value TS.
Il raccordo 34 del dispositivo di alimentazione 6 comprende una strozzatura 43 della sezione di passaggio del combustibile per smorzare le oscillazioni della pressione generata dalla pompa ad ingranaggi 22 . Inoltre, la strozzatura 43 ha il vantaggio di evitare una caduta di pressione all'interno del gruppo di pompaggio ad alta pressione 17 quando parte del combustibile è spillato per la post-combustione. The fitting 34 of the feeding device 6 comprises a constriction 43 of the fuel passage section to damp the oscillations of the pressure generated by the gear pump 22. Furthermore, the restriction 43 has the advantage of avoiding a pressure drop inside the high-pressure pumping assembly 17 when part of the fuel is tapped for post-combustion.
Il metodo descritto risulta economicamente vantaggioso perché le modifiche necessarie per adattare un generico gruppo di pompaggio ad alta pressione a questa nuova funzione sono relativamente modeste. Infatti, è necessario aggiungere nel gruppo di pompaggio ad alta pressione 17 un'uscita aggiuntiva definita sostanzialmente da un tubo di uscita 44 innestatile con il raccordo 34 in modo da alimentare il combustibile pompato dalla pompa ad ingranaggi 22 al condotto dei gas di scarico 25. The method described is economically advantageous because the modifications necessary to adapt a generic high pressure pumping group to this new function are relatively modest. In fact, it is necessary to add in the high pressure pumping assembly 17 an additional outlet substantially defined by an outlet pipe 44 which can be coupled with the fitting 34 so as to feed the fuel pumped by the gear pump 22 to the exhaust gas duct 25.
Sebbene nella presente descrizione si sia fatto specifico riferimento ad un particolare tipo di rigenerazione, l'applicazione della presente invenzione si estende a qualsiasi tipologia di rigenerazione del filtro antiparticolato che richiede l'impiego di combustibile . Although specific reference has been made in the present description to a particular type of regeneration, the application of the present invention extends to any type of regeneration of the particulate filter which requires the use of fuel.
Claims (13)
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT001123A ITMI20071123A1 (en) | 2007-06-01 | 2007-06-01 | REGENERATION METHOD OF THE PARTICULATE FILTER OF AN INTERNAL COMBUSTION ENGINE AND INTERNAL COMBUSTION ENGINE THAT CAN IMPLEMENT THIS METHOD |
JP2010509812A JP5649960B2 (en) | 2007-06-01 | 2008-05-28 | Method for regenerating a particle filter of an internal combustion engine |
KR1020097024884A KR20100017471A (en) | 2007-06-01 | 2008-05-28 | Method for regenerating a particulate filter of an internal-combustion engine |
US12/602,209 US8371110B2 (en) | 2007-06-01 | 2008-05-28 | Method for regenerating a particulate filter of an internal-combustion engine |
PCT/EP2008/056532 WO2008145667A1 (en) | 2007-06-01 | 2008-05-28 | Method for regenerating a particulate filter of an internal-combustion engine |
EP08760128A EP2165052A1 (en) | 2007-06-01 | 2008-05-28 | Method for regenerating a particulate filter of an internal-combustion engine |
CN2008800180986A CN101680326B (en) | 2007-06-01 | 2008-05-28 | Method for regenerating a particulate filter of an internal-combustion engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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IT001123A ITMI20071123A1 (en) | 2007-06-01 | 2007-06-01 | REGENERATION METHOD OF THE PARTICULATE FILTER OF AN INTERNAL COMBUSTION ENGINE AND INTERNAL COMBUSTION ENGINE THAT CAN IMPLEMENT THIS METHOD |
Publications (1)
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ITMI20071123A1 true ITMI20071123A1 (en) | 2008-12-02 |
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IT001123A ITMI20071123A1 (en) | 2007-06-01 | 2007-06-01 | REGENERATION METHOD OF THE PARTICULATE FILTER OF AN INTERNAL COMBUSTION ENGINE AND INTERNAL COMBUSTION ENGINE THAT CAN IMPLEMENT THIS METHOD |
Country Status (7)
Country | Link |
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US (1) | US8371110B2 (en) |
EP (1) | EP2165052A1 (en) |
JP (1) | JP5649960B2 (en) |
KR (1) | KR20100017471A (en) |
CN (1) | CN101680326B (en) |
IT (1) | ITMI20071123A1 (en) |
WO (1) | WO2008145667A1 (en) |
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US8464516B2 (en) * | 2010-11-18 | 2013-06-18 | Tenneco Automotive Operating Company Inc. | Inlet for exhaust treatment device |
DE102015215373A1 (en) * | 2015-08-12 | 2017-02-16 | Volkswagen Ag | A method for the regeneration of exhaust aftertreatment components of an internal combustion engine and exhaust aftertreatment device for an internal combustion engine |
DE102015215685A1 (en) * | 2015-08-18 | 2017-02-23 | Robert Bosch Gmbh | Fuel supply |
CN108119274B (en) * | 2016-11-29 | 2023-08-01 | 罗伯特·博世有限公司 | Fuel supply pump in fuel injection system |
JP6805021B2 (en) * | 2017-02-21 | 2020-12-23 | 株式会社Soken | Fuel addition device |
CN106948906A (en) * | 2017-04-19 | 2017-07-14 | 中国第汽车股份有限公司 | A kind of hydrocarbon spraying system from supercharging |
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JP3944413B2 (en) * | 2002-05-24 | 2007-07-11 | 株式会社日立製作所 | High pressure fuel supply pump |
SE524181C2 (en) * | 2002-11-05 | 2004-07-06 | Volvo Lastvagnar Ab | Method for regenerating a particle filter and vehicles in which such a method is utilized |
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2007
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-
2008
- 2008-05-28 EP EP08760128A patent/EP2165052A1/en not_active Withdrawn
- 2008-05-28 WO PCT/EP2008/056532 patent/WO2008145667A1/en active Application Filing
- 2008-05-28 CN CN2008800180986A patent/CN101680326B/en active Active
- 2008-05-28 KR KR1020097024884A patent/KR20100017471A/en not_active Application Discontinuation
- 2008-05-28 US US12/602,209 patent/US8371110B2/en active Active
- 2008-05-28 JP JP2010509812A patent/JP5649960B2/en active Active
Also Published As
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WO2008145667A1 (en) | 2008-12-04 |
US20100186372A1 (en) | 2010-07-29 |
JP2010529345A (en) | 2010-08-26 |
KR20100017471A (en) | 2010-02-16 |
CN101680326A (en) | 2010-03-24 |
EP2165052A1 (en) | 2010-03-24 |
CN101680326B (en) | 2013-07-24 |
JP5649960B2 (en) | 2015-01-07 |
US8371110B2 (en) | 2013-02-12 |
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